ADB introduced the full-fledged special drawing right (SDR) approach to the ADF loans in 2006. Under this approach, loans were committed in SDR, and borrowers’ obligations for repayment of principal and payment of interest charges were determined in SDR (endnote vii). However, starting 1 January 2017, DMCs eligible for COL have the option to select the liability currency for each COL up to the time of loan negotiations, after which it cannot be changed. In addition to SDR, the choice of currency is one that is available under ADB’s Flexible Loan Product and is also in the SDR basket, subject to the confirmation of the availability of such currency by ADB.10 If any of the euro, the pound sterling, SDR, or yen is chosen as the liability currency, exchange rates for the loans11 would be based on the ADB rate and determined during formal loan negotiations (endnote viii).